#include<bits/stdc++.h>
using namespace std;
int main(){
	char n;
	cin>>n;
	if(n=='z'||n=='Z') cout<<char(n-25);
	else cout<<char(n+1);
return 0;}

/**************************************************************
	Problem: 1969
	User: fzy001
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/